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org.hibernate.MappingException: Unknown entity:

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kcorp

Post subject: org.hibernate.MappingException: Unknown entity:

Posted: Thu Mar 30, 2006 9:25 am

Newbie

Joined: Tue Mar 21, 2006 4:25 am
Posts: 13

Hello,

I am trying to find an element by it's id. However it hibernate is raising the exception
org.hibernate.MappingException: Unknown entity: mypackage.common.InterfaceAssignmentDef. Now I use the following code to retrieve an AssignmentDef from it's Id.

Code:

    @SuppressWarnings("unchecked")
    public T findById(ID id, boolean lock) {
        T entity;
        if (lock){
           
            entity = (T) getSession().load(getPersistentClass(), id, LockMode.UPGRADE);
        }
        else{
           
            entity = (T) getSession().load(getPersistentClass(), id);
        }
        return entity;
    }

I had copied this code from an example I had seen on this same website. Now this code works fine for other objects without any problems (Assignments, Schools, etc) However it seems to give a problem on this particular class.

The only difference in this class is that this class (AssignmentsDef) has a List object containing the a list of objects of type Assignment. Then there is another object of type Class that has a List of type Assignment. Therefore the assignment class is like a link table in databases.

Now I searched on the internet and I foound out that it could be from the mapping file not being found. I searched for the mapping file inside the War file and I found it.

I also find a post here talking about a bug that was solved in 3.1, however I downloeaded this and I still could have this problem :(

I do not know what to do next since the code is practically the same as in other classes I have.

thanks and regards,
kcorp

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kcorp

Post subject:

Posted: Thu Mar 30, 2006 9:53 am

Newbie

Joined: Tue Mar 21, 2006 4:25 am
Posts: 13

Just for further information:

I did this method instead of the other one I placed in my previos post to search by id:

Code:

public SkillDefinition findById(Long id){

   Criteria search = getSession().createCriteria(AssignmentDef.class);
   Criterion uid = Restrictions.eq("id", id);
      
   search.add(uid);
      
   List<InterfaceAssignmentDef> result = search.list();
   InterfaceAssignmentDef assignmentsDef = null;
      
   if(result != null){
         
       skill = result.get(0);
   }
            
   return skill;
}

This worked fine!!

However I am still not a satisfied bunny :) I really want to know why the other method is not working. I am posting the code of the other method again, and explain better how it works:

Code:

@SuppressWarnings("unchecked") 
public T findById(ID id, boolean lock) { 
   T entity; 
   if (lock){ 
            
      entity = (T) getSession().load(getPersistentClass(), id, LockMode.UPGRADE); 
   } 
   else{ 
            
      entity = (T) getSession().load(getPersistentClass(), id); 
  } 
   return entity; 
}

In this method there is use of generics. T and ID are defined when initializing the class. In this case they are initialized as T = InterfaceAssignmentDef and ID = Long. As I said, this works fine in all the other classes I have, it just does not want to work in this one :(

I would be really greatfull to anyone who replies. I have made it worked, however I would not like it to remain working in that way, since it just looks like a hack.

thanks and regards,
kcorp

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kcorp

Post subject:

Posted: Fri Mar 31, 2006 6:37 pm

Newbie

Joined: Tue Mar 21, 2006 4:25 am
Posts: 13

Please know one knows why this could be happenening? I really can not find an explanation why it is failing :(

reg,
kcorp

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